the details are not important. Can you trace a returned product (without receipt) from a store to vouchers and then to another product purchased with these vouchers?

No. Taken the good back and been given vouchers which have been spent personally. Is there usually a link if no receipt is produced?

I was really stupid about 2 years ago. I returned a product to a well know retailer. Did not have the receipt but from their product sticker they confirmed it was their product. They did not have another in stock at the branch and gave me a card with the credit on it. I have subsequently used the voucher to purchase something else. Is there a way to trace the initial credit card purchase to voucher refund to new product. If so I think my company had found out. Any info would be grateful.