I disassembled and reassembled BILLY bookshelves after 4 years without any visible damage, and they served for another 3+ years until I moved overseas and sold

I disassembled and reassembled BILLY bookshelves after 4 years without any visible damage, and they served for another 3+ years until I moved overseas and sold them. Not sure if they survived the second move, but they definitely did the first time.