Same as the others, partially dismantled would be fine or completely into ziplock bags (or similar) is enough, you do not have to disassemble into "as new" parts! If the box and instructions are in good condition then you may get more for it. I've never wanted to boxes when ordering used sets online, and it does save on shipping, but if it is a larger set, you may be reduced to pick up /meet up anyway.

Goodluck!