@MrsL1123, I feel your pain as I have had years of this with my (adopted) daughter, who clearly has issues related to her very poor start in life. There’s a myriad of complicated reasons why my DD feels compelled to ‘liberate’ (mainly sugary) snacks from our kitchen cupboards, gorge on them in secret/private and then conceal the evidence/wrappers in THE most unfeasible places.
As someone with a healthy relationship with food, it drives me absolutely crazy and has probably cost me three teeth (all now crowned) through excessive grinding clenching, because the alternative would be Mount Vesuvius erupting through my skull.
In my rational moments, I can accept that many people have an emotional relationship with food (you only have to read the weight loss threads here), that many children lack any impulse control (there are interesting scientific experiments you can Google, I think one may be called the ‘marshmallow’ test, and that all behaviour is communication. So, when my DD gorges to the extreme (and I find a tonne of wrappers behind the wardrobe, say) that there is something untoward going on in her life, be it school stress, alpha girl woes or puberty- related hormones.
The best advice I have ever been given is to load a Tupperware box with treats at the beginning of the week, explain that is the child’s allowance until xxx day, and it’s up to them if they eat the contents in one go or eke them out, but no more will be given. (And then lock the rest of your treat/snack foods away in your car or somewhere else the culprit cannot gain access to them, because some people literally cannot help themselves and have no self control).