I've had them question me for the same thing. They also don't understand that it takes much longer if you don't find the item.
@aribacat wrote:
I did the pet store one several times for the monthly one. The 1000 item one was not at a time that I could do it and so I didn't take it. Never got asked again and don't see the monthly one. I did get an email asking why so many items marked not available and I said that they did not carry the exact one on the listing and they say no substitutions, also the store does not carry several brands they ask for. I guess I goofed by saying the truth. No big deal, hardest I've ever worked for the price.