The person who assembled my product did not volunteer that there were some pieces that did not exactly line up. I noticed it right away and pointed it out to her. She stated that the manufacturer had measured wrong. This may have been true but I do know how to put furniture together and know that sometimes it is the assembler's skill level. I did keep the bookshelf as it was not going to be in a prominent area of the house and I did not want the extra work of having to send it back. My suggestion is to stay with the assembler (somewhat defeats the purpose) and watch their process.