Gave him his stein from the halfling swashbuckler. Had to charm him using evil eye enchanter ability in order to get him to accept it:
Grype nearly faints. His eyes begin to tear up. 'Oh my sweet stein of sloshing! This is the great treasure. A shiny piece of broken metal! Ha! You never win when you deal with a Blue Talon!'
Received Foot of Candlestick. Obviously missing some dialogue there so I used keywords and he responds to "stein of sloshing":
Grype is staggering from one too many pale ales. 'Listen... Listen here. I have been forced to cut back on my drinking because my favorite sloshing stein was stolen from me by some stubby little thief in black. I was jus' minding my own business and picking flowers in the fields of the drixies when he comes and snatches it from me. Return it to me, and I will give you this treasure I acquired from a sarnak revenant.'