Bill and Lord are both wrong, I believe. The store doesn't change... you just get a new dialogue option from Ribald which accesses a different merchant. The map itself doesn't change.
And maybe a few containers will make people go hostile, but I've rooted through them before. Perhaps only a few of them cause people to go hostile, as I've seen glaring discrepencies like that before (Read: Temple of Lathander. Even when you're a bloody CLERIC there. Drives me mad.)
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