Posted at 2015-11-08 04:50:04 — Link
I'm pretty sure this isn't intended to work this way but I could be wrong.
It appears that the game only checks if your inventory is full when the page loads and not when you click the "accept" button on item auctions. I was able to open several windows of different auction items while my inventory was at 29/30 and accept them all, allowing me to exceed my inventory limit. I did this a second time to make sure that it wasn't a one time thing.
OS: windows 8
browser: chrome