I recently bought 2 bullet molds from 2 different sellers on evilbay. First mold came in packed very well, and the blocks were wired together with a bread loaf tie. Perfect, and casts very good boolits.
The 2nd mold came in it's original Lyman orange plastic box, mold blocks were placed in the box loose without any padding, bread tie, rubber band, nothing. Needless to say that the mold blocks beat against each other for the entire trip. Smoked the mold several times, used Kroil in the cavities, tried everything, but the mold would not drop the boolits. Finally Leemented the mold to see if that would help. Yay, success, finally.
Moral of the story: In the comments section of paymememepal include a note that mold blocks should be properly packaged for shipping. Common sense isn't very common. one small rubber band would have saved me several hours of frustration. Both the seller and I goofed up on this transaction.