Some of the small (video tape) mailing boxes are labeled "Flat Rate" and some are not. They are the same size, but the ones not marked, "Flat Rate" do not get the flat rate. Seems silly, but I asked at the Post Office. I bag most stuff in 25's (since 25 of something = most Trade Items). You can put 5 vertical stacks of 25 in those boxes, topped with 2 horizontal stacks, squished slightly to fit. That's 175 tokens in a small flat rate box. You can technically stuff in a few more, so 180 is pretty near the upper limit. The small Flat Rate Box (FRB) is $4.95 to mail. <br /><br />I believe you can get 6 of the small FRB's in the Medium Flat Rate box. At $10.35, that's the better deal if you have more than 2 Small FRB's. I think you can get 9 of the Small FRB's in the Large FRB, and you still have a small squarish space that'll hold about 200 tokens. It's somewhere around $14 to ship, and weighs about 50 lbs. It's the most cost effective you have have more than 6 small FRB's of tokens. But you do need to fill any empty space with packing material and tape the heck out of the outside of the box (not just on the seams). Doing the math, that's about 1,800 tokens in the Large FRB, and I think that's about how many I sent in when I sent a Large box. <br /><br />Yes, the boxes are free, but I'm not sure if you're supposed to use multiple boxes in other boxes. I think that if you ask at the Post Office, they'll tell you not to. I've never heard of anyone having a problem with it, though. When I can, I re-use the small boxes (from prior shipments) that I put inside the big box. <br />