Is a 3-5 year idle battery pack recoverable?

Might have a chance to buy a Gen 2 battery pack for $200. The risks, besides the usual unknowns, is that it was removed from the car and has just been collecting dust anywhere from 3-5 years. Can modules that have been sitting idle for that long still be recovered properly conditioned and balanced? Want to know if there's at least a chance that I might be able to get it working, otherwise I'm paying $200 to get a hazardous disposal problem.

 

Thanks. The guy stopped responding to emails so might have lost the chance. Reconditioning means cycling the modules through the charging and discharging process?