So, an interesting thing here, I bought apistan this year from one of the big box stores. I had a brutal mite count after removing. I brought this up at my local bee club meeting and was told that other people had the same problem due to it being expired. I looked on the one box I had left and the date was blacked out by marker. Just saying, at 259.00 give or take a box, should this be a buyer beware issue?