So I just put the first thing I've ever mailed internationally. I'm excited but now I'm really worried. I used an envolope with a clasp, but the glue wasn't wanting to stick. I'm worried the flap is going to come undone and it's gonna rip open. I should have held onto it a little longer to put tape on it, but I was being rushed. Do you think it's too much to hope that the post office is nice a puts a price of tape on it?