Till in this context means a drawer or a small chest. Till has several meaning and one of those is "A drawer, small chest, or compartment for money, as in a store." Thefreedictionary.com provides 4 different definitions of till:
Till 1: To prepare (land) for the raising of crops, as by plowing and
Till 2: Until
Till 3: 1. A drawer, small chest, or compartment for money, as in a
store. A supply of money; a purse.
till 4: Glacial drift composed of an unconsolidated, heterogeneous
mixture of clay, sand, pebbles, cobbles, and boulders.
Usage Note: Till and until are generally interchangeable in both
writing and speech, though as the first word in a sentence until is
usually preferred: Until you get that paper written, don't even think
about going to the movies. Till is actually the older word, with
until having been formed by the addition to it of the prefix un-,
meaning "up to." In the 1700s, the spelling 'till became fashionable,
as if till were a shortened form of until. Although 'till is now
nonstandard, 'til is sometimes used in this way and is considered
acceptable, though it is etymologically incorrect.