There is some horrendously bad instructions during the early quest. This is for first timers.
During the quest to get the ledger for Silver- claws, you are inside the warehouse with Velsa. After using the stink apple, she knocks out the guard on the upper level and says "Get the ledger from Silver-Claws' office and meet me outside". This is a LIE. The inference is that the office is somewhere in the warehouse you are currently in. And that you need to find the ledger, and THEN leave the building. So you end up wasting all kinds of time running around looking for an office THAT DOES NOT EXIST inside the warehouse. What you are actually supposed to do is follow Velsa outside by figuring out how to get to the upper level exit. Once outside Velsa will lead you to the office. You do NOT 'get the ledger' and then meet her outside. You go outside, follow her to the office and then go get the ledger.
This is hoping I can help first time Thieves guild questers who are getting ready for the event.