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I suspect panels are going to be a harder sale these days with the 25% tax rebate on new panels available. Unless someone is looking for the specific panels to match with an existing setup, you'd need to drop prices quite a bit on used panels, and/or include all the mounting hardware/etc..

I'm a proud owner of the 12x cells, 4x will will be used in 12V and 8x in 24V configs. Below is a comparison of the seller's capacity test vs my test (based on random selection of cells). I tested to down to 2.5V@10A per cell and the results speak for themselves. I'm happy to have dealt with an honest seller. 
 
Cell   Igg (Ah)  my (Ah)     
B2    108          112.22
B7    112           116.64
B14  111            113.27
B16  111            116.58

ALL SOLD.

ALL SOLD.

My assumption is that the outlier (98AH) was weak to start with. When I originally purchased them I didn't have the tools to test the capacity, so I trusted what they were sold as (~120AH). Given they were 2nd life already, I doubt this was the case, and they were definitely NOT matched cells. You're also missing the extra 6AH in your calcs, as this is what a manufacturer will test to. I only tested down to the typical low-voltage cutoff (2.9v ea, i.e., ~47v). I did test a bunch of them down to 2.5v (incl. the outlier which has 104AH) and they all had an extra 6-7AH extra, which puts them all much closer to the original 120AH.
Regarding the cycle count, that's what the Victron BMV reported. I don't actually know how it counts cycles, but I suspect it resets at 100%, and I didn't always cycle to 100%, and would sometimes cycle between 60 and 80% for instance. This was part of an ESS setup, in a 16s2p config, so there's no reason for the cells to be loaded differently aside from their different internal resistances and mismatched nature of 2nd life cells.

They were charged with bench PSUs and used one of these to check capacity: https://www.aliexpress.com/item/4000479624068.html.
 

They are originally LBSA 2nd life cells.
IIRC they were 135AH cells in their first life being sold as 120AH 2nd life cells. I have no idea how they were used in their 1st life, but my assumption is EV/golf carts/etc..

Item: Smart ANT BMS 7-16S 320A with LCD x2
Age: 2.5y
Price: R1000 ea.
Condition: Excellent, around 900d of running time
Warranty: No
Packaging: None
Link: https://www.aliexpress.com/item/32997552090.html
Item: JiaBaiDa 7-20S 300A Smart BMS with BT and RS485 port x3
Age: 1.5y
Price: R2500 ea.
Condition: Unused
Warranty: No
Packaging: None
Link: https://www.aliexpress.com/item/1005003092762026.html
Payment Method Accepted: EFT
Location: Weltevreden Park, JHB
Reason: Selling my DIY batteries
Shipping: Yes, cost and risk for buyer's account
Collection: Yes

You don't need to amend the lease, you can just add an addendum to it, signed by both parties, which supercedes whatever problematic clauses are in the lease.
It should be noted that a landlord can't simply enrich themselves at the tenants expense, i.e., take ownership of tenant property or improvements the tenant may have made. I'd imagine the clause that allows this would not be legally enforceable (IANAL).

Looks like we will be amending the contract.

You don't need to amend the lease, you can just add an addendum to it, signed by both parties, which supercedes whatever problematic clauses are in the lease.
It should be noted that a landlord can't simply enrich themselves at the tenants expense, i.e., take ownership of tenant property or improvements the tenant may have made. I'd imagine the clause that allows this would not be legally enforceable (IANAL).

What I've commonly seen in the field is faulty connections so before removing the panels completely I would suggest doing an inspection on any joints and then testing the cables from the panels to the inverter. If no problems are found then test each panel individually.

Take the suspect panels down and set them up on the ground.
Measure the volts of each panel..

Correct