Avoid UPS. Unless you want the UPS letter envelope mixed in with the 100lb packages in the UPS truck. I wish I could find a picture of the CGA graded UNC66 note I bought the seller mailed by UPS 2 day service that got crumpled
. Since people are now buying the holder and not the note inside, would the VF+ note that is now housed in the crumpled holder that is labelled UNC-66 still qualify as UNC-66 and fetch the same price???
In short, use the postal system. Much safer from handling letters than UPS/Fedex that handle packages. I would place in an acetate or mylar holder between two leaves of stiff cardboard.
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