Comments about 6"(L) x 4"(W) x 4"(H)- Staples® Multi-Depth Corrugated Shipping Boxes:
Problem was with 8x6x4, not 6x4x4 (but I wasn't given a chance to review that box).
The bottom flaps work properly, but the top flaps overlap by 1/2" to 5/8" so they can't be sealed tightly. I'm afraid they'll come open in shipment. The overlap makes the box look really cheap, and therefore makes my use of them look bad. Don't want to use the rest of them.