If it was to gain insight on product placement the store failed the test on the 1 shop I did. One product was placed behind a tag a Nair product. The other product was on a different shelf, the very bottom one. Both were in a locked cabinet that required employee assistance. Not like the consumer was putting back in the wrong place. Maybe the client was wanting to find out if their product was being placed and stocked well to determine why the products were selling better or worse at stores within the national retail chain.
But then there is the mystery of of the purchase requirement. If it was just about placement the MSC could have taken a less expensive route by just having the shopper take photos. Not sure the client gained a ton of consumer mindshare (if that was part of their goal) as many completed multiple shops.
I never heard of the product before seeing the assignment posted. Certainly not a product you could regift w/o getting a raised eyebrow from family or friends ... LOL.