Your credit contract mostly likely specify its an unsecured loan without liens on what it was used to purchase, but if the loan is non-performing (i.e. debtor does make repayment) the bank have it on record what was purchased with the loan. Thats helps the bank offload the loan to the debt buyers (i.e. debt collectors) because the collectors can target something specific for repo. Legally, it doesn't have a leg to stand on, but it won't stop collectors making ridiculous threats.
I've known 19y/o kids who borrow $3,000-$4,000 for a in-car entertainment system, some expensive electric guitar or even an oversized TV when they first move out.
Of course they never budgeted their repayments, next thing you know, these know-nothing kids miss payments, they debt gets passed off to the collectors who are more than happy to threaten to 'lawfully sieze' their toy.
Collectors only want cash of course but having something to specifically to threaten the debtor with is convenient for them. Intimidation tactic.