While was a student in a country 10 years Back I took few phones and a tablets and other accessories over monthly installments.

I moved to my home town due to some circumstances and ended up not paying the installments.

I want to pay this outstanding but not sure how to as those accounts are 10 years back and unable to trace.

Also I am not sure about exact amount I need to pay.

If you purchased them from known companies, and you were paying through bank accounts, then it is easy.

You can refer to your transactions, and you will get the details.

If you were not able to reach to a result, then you do not need to do any thing, provided that the owners are non Muslims.

If they are Muslim, then you need to pay the balance to poor people on their behalf.