Question about calculating the sodai gomi cost

Hey everyone, sorry for the dumb question, but I have a bunch of cheap box shelves that I would like to dispose of through sodai gomi. On the website for sodai gomi in Tokyo, there’s an option for box shelves, but it seems to assume that the shelves are assembled. However, if I dismantle them, it’s possible to stack them into a volume roughly equivalent to one single box shelf. Obviously, the price difference is quite significant between these two calculation metrics, so I thought I’d ask if anyone knows if they’ll collect the disassembled shelves based on volume like this or if I should still pay for each individual assembled unit. Thank you for your help!