It's not the Feds you need to worry about....just check with local/State tax laws to see their rules regarding goods purchased abroad....
https://help.cbp.gov/app/answers/detail/a_id/295/related/1/session/L2F2LzEvc2lkL01jUVpwZnFs/~/state-sales-taxes-on-goods-purchased-overseas-and-brought-back-to-the-u.s.
https://help.cbp.gov/app/answers/detail/a_id/446/related/1/~/state-sales-taxes-on-goods-purchased-overseas-and-brought-back-to-the-u.s.
For example, FedEx sends me copies of the bill of lading they provide US Customs (showing declared value)...you can be sure they would supply the same info to your state tax agencies....
With many states in the red on their budgets....this may become more of an issue as they try and find ways to "plug holes"...