This isn't really my field, so feel free tolaught at this , bt could you ring round other places and see if you can get some more? now tell me it is something you make up yourself and takes months to put together . I think this is one of those things that happens, and not just in labs, with daughters who are also doing research work I often find things have gone walkies luckily they work in different fields so my research papers are safe! what I would do if I had solutions etc. that were liable to go missing is label my stuff as something else, then if anyone 'borrows' it in the future you will know who it is.