Money (sterling) locked in the drawer illustration

A colour picture depicting a construction managers office in which he has a pedastel desk with say 3 drawers one side labelled (Q files, Health and Safety and Environment. The other side has a single larger drawer labelled Daywork Funds. This drawer must depict a opening sufficient enough for sight of say £1000 in sterling sat within it but also that it is to be preserved/locke away and NEVER spent. Around the office will be the usual drawings, specification documents and theodolite instruments typucal of a construction protacabin.