Such a crappy day

Well, my new corn snake has been stolen I believe. I went to feed him yesterday when I got home from work.....I had it's food ready for it and everything! I looked in the tank and I couldnt see it. I started picking up the rocks in the tank and nothing. I dug through all the reptile mulch and still nothing. Dug through it 4 times! I was so upset when I couldnt find it. I called my friend, Dodee, I called Mum. I almost had a panic attack from being upset. This is crazy! Someone in my house has taken it! Its the only way it could have gotten out! Its just a baby snake so it was too short to reach the lid, not strong enough to push the lid up, there were rocks in the corners of the lid to hold it down, i bought these locking clips for the lid so nothing could push it up from the inside and there are no holes in the tank where it could have crawled out! The only way it could get out is if someone took it out! Dad never goes in my room so he wouldnt have known about it, Mum said I could get another snake, so she wouldnt have taken it. My only other suspect is my brother. He is such a prick these days he wouldnt admit to it. I called him at his friend's house and he just laghed at me and said I probably had a hold in my tank. If I had door knobs with locks on them I guarantee that snake would still be in its tank. My brother either ran out of money or he is on something. Its the only thing I can think of. Its stupid! I cant even trust my own family members not to take my things!