Read the details from the bug research / implementation:
Quote:
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if u need a sack from those 4 quest npc, 1st make sure u have TWO open inventory slots. give him/her the jeb's seal, then u will 1st receive the seal back then the sack. thats why u need 2 inventory slots open. they no long give out sack when u say i need a sack.
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Sounds like you aren't handing in the seal and just saying the phrase