The moral issue seems clear, so I'll deal with the practicalities.
What are the consequences if you dispose of the records? He asks for them back or damages, i.e. the value of his loss. You counterclaim for your loans.
If you want to protect your position, write to him at the most recent address you have - get proof of posting.
Document the loans, terms etc and the records. Give him a reasonable time to reply, to repay and deal with the records, or you will dispose of them and put the proceeds against his debt.
You may want to get 2 prices from record shops if they have a material value.
What are the consequences if you dispose of the records? He asks for them back or damages, i.e. the value of his loss. You counterclaim for your loans.
If you want to protect your position, write to him at the most recent address you have - get proof of posting.
Document the loans, terms etc and the records. Give him a reasonable time to reply, to repay and deal with the records, or you will dispose of them and put the proceeds against his debt.
You may want to get 2 prices from record shops if they have a material value.