They've reared their ugly heads again, this morning, with a request for Sweeney Todd. The particular version the patron needed appeared in the catalog as "Master Microfilms" and was not otherwise listed as available in HOLLIS.
A call to Imaging Services confirmed that the item could be reproduced (at a cost, of course). Turn-around time is typically 5-10 working days. Patrons who go this route should be directed to the Imaging Services office in Widener, Room G-81.
However: there's a better, cost-effective option for students and FAS affiliates: ILL.
I confirmed that non-circulating items, like Master Microfilms, can be ordered this way.