Was that really the labaz?

[Ehtnisba]

I suggest a comparative inventory be made. If the cache is fictitious, the discrepancy will be revealed. Compare total inventory before the expedition to inventory of tent contents to inventory to cache to inventory of recent finds at the cedar. Include alleged stolen vodka, factor stomach  contents.  It should be instructive.

Устройство лабаз means building the labaz, not "device".
 
You can't even think about building a labaz. - this how I read it.