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It is sealed with regular packing tape. I have read that Certain Staples and OD stores check in-store returns even if they're sealed. I think this happens on a store-by-store basis.

In that case, It's not worth taking the risk with the sealed box method.

Stating the obvious, Is the DNA an option for you?

I'd really rather not do DNA since I have a good relationship with the delivery workers. It makes things awkward. I'll think about it.