Do you really think it's that easy? Any junior investigator could examine the purchases and tie them to you. If the card was really opened fraudulently it would be easy to show that the goods were shipped somewhere completely isolated from the cardholder.
It's not that easy when there's 2 or 3 degrees of separation between the source of debt and the collector. And also, what collections agency is going to go through that sort of trouble unless it's for maybe tens/hundreds of thousands of dollars?
You don't think is possible to have an accomplice to ship the goods too? PO box under a fraudulent ID? Ship to random locations and pick it up before the home owner gets it?
I wrote my comment on the premise that "why can't a cardholder lie and claim they never accrued the debt [on a specific card]". If an investigator analyzes all purchases from the card and finds many of the purchases were things you took possession of, or hotels you stayed at, etc, that's evidence against the liar who falsely claimed to be a victim of so-called 'identity theft'. It's very hard to launder purchases without some trail leading back to you.
by the time it gets sold once and you are 5 years in, the evidence is vapor. if its tied to assets, or large enough, they will come for them tho because bounties.