please help me lie (a bit time sensitive)

ok so basically my parents just realized a few minutes ago that the four big boxes of band aids they bought about a month or so are missing. i used them all. they told me to look in my bathroom for any band aids. i have about 4 band aids hidden in my bathroom but i feel like it'll be suspicious if i come to them with only four band aids. they'll probably ask where the rest of the box went, and i cant really just tell them that a box that used to have 80 band aids only has 4 now. i'm not ready for them to know i self-harm, but i feel like the only thing i can do is act clueless about where the band aids went. eventually they'll get suspicious of me, which i can't let happen. what do i do???