The cells are from bae hybrid drive buses and transit conversions, known for faulty BMS boards. Another seller has offered another two pallets of modules so seems like this is not fake - looking on the internet quickly there seems to have been large recalls for the ‘bae hybrid drive bus’ due to electronic shorting faults.
A123 cells have definitely been used by BAE Systems for a long time (so selling these used cells at such a cheap price is possible). I have quoted “https://ntl.bts.gov/lib/35000/35700/35796/DOT-VNTSC-FTA-11-01.pdf” below:
"Currently, under the FTA/NFCBP funded Calstart Compound Fuel Cell Hybrid Bus for
2010 or BUS-2010, BAE is integrating HybriDrive with the air-cooled A123 Li- Ion
Nanophosphate (LFP) battery, and with a fuel cell APU to extend the range of a 40 ft
Orion low-floor bus. This fuel cell hybrid-electric bus will be demonstrated by the San
Francisco Municipal Transportation Agency (SFMTA).
The HybriDrive is also compatible with other bus platforms and RESS options: the latest
New Flyer (DE40LFQA) bus also uses the BAE HybriDrive with more advanced, lighter
and longer lived nano-phosphate lithium-ion batteries with 200 KW peak power and
cooled with forced air (from Lithium Technology Corp of Plymouth Meeting, PA). "