The envelopes don't fit in post office boxes!
I am currently in the process of doing DNA tests from Embark for my two dogs. I got a surprise yesterday when I tried to put it into a mailbox. Apparently mailboxes now only take envelopes less than 1/2 inch in width and the sample tube must be a little bigger than that. When I couldn't drop it in a mailbox in front of a supermarket I went to the post office and same issue. This was yesterday, 4th of July, so post office closed. Today is Sunday. I don't trust my mailman to pick it up from my home mailbox so I think I will have to go the post office tomorrow when they are open and hand it directly. Just annoying. I really want to see my dogs' DNA and see if thy are full blooded sisters.