lost 30+ dilaudid last night

please read as i need an opinion on all of this. i remember doing a shot at around 9pm. after that i put them in my backpack which is where they always go. i was at my ex's at the time but this doesnt matter as i always put them in my backpack, even when im home, its a habit at this point, there is no way i would put them anywhere else. we went out to get ice cream and came back while her sister was home the entire time. i go to do a shot at 11 and they are fucking gone, they were in a sock where i held my rig and shit and the sock and everything in it was no where to be found. we were only in her room and we tore that shit apart and they were nowhere to be found leaving the only place to be is stolen by her sister. i even remember being sketched out about them being in there around 10 and i went and made sure they were in my backpack and moved the backpack to a less noticeable spot in the room. i had no suboxone or anything so i would have been sick all next week. i basically told my ex that she HAD to give me the 150 for the pills, even if she didnt steal them apparently her sister did, and im not going to attack her sister trying to get my pills back, she can try and do that, i dont feel it is my place to and it would be awkward. now my ex is pissed at me. i didnt know what else my options were, if i had subs, i could eat those and try and forget about it, but i didnt, and i was not going to go sick because my shit dissapeared. i know this may not have been the best way to go about this but i know where i put my shit. i dont just misplace 30 pills, that doesnt happen, and theres no way im gonna go from being good for a week to being sick for a week. although i dont think her sister wouldhave stolen them, idk what any other possibility would be. its lost in her room (which doesnt make sense because i put them in my backpack) or stolen by her sister