I wouldn't do this... yet. What I've done, twice now, is ask for the manager. Explain that you understand putting items aside but that they've been put aside for X days and that you're ready to buy now. Unless there is a future pickup date, they will sell it to you.
+1 I played it this way. Even gave my name and number and said when you are fed up waiting, give me a call. I had beer within two days.
Congrats on a sweet haul.