Can imported packages be delayed upon entry because of goods being undervalued?

Most likely you’ll have to pay a charge when signing for it.

Yes, but…

A package can only be insured for the amount it’s declared as. So if a shipper sends you a PS5 and says it’s worth $5, and that package is lost or destroyed, the insurance will only cough up $5. And it’s the receiver that’s fucked, not the merchant.

I’ve gotten tons of packages over the over that were “USB accessory” with a value of $1.05. It was all kinds of shit worth under 5 bucks. Shipper being lazy because it didn’t matter. But when you go over that, they have always been more accurate about what they put on the label in my experience.