That is why I suggested the idea of posting a password coded jpeg at the start of the experiment - I could download the jpeg and once he provides the password (after I had provided my results) I could open and the jpeg would say which product had pheromone.
Yes there is still some possibilities of messing with results there (like not actually putting which bottle has the phero’s in the jpeg at the start - putting putative phero’s or pheros with hard to quantify effects in the bottle like putting TAH in the bottle for a guy)