I happen to be made of antimatter as well, so I simply take the kebab apart and extract the popcorn. I then split the popcorn in half, convert half of it to matter while the other half remains antimatter, then finally place them near each other. It is impossible to determine which half is matter or antimatter, unless you collide them with ordinary matter. The normal popcorn will do nothing, while the anti-popcorn will explode.
I manage to raid your base, where I find the chest with the popcorn in it. I take the popcorn with me to the End, where I place it inside a chest located 10,000 blocks from the spawn platform, and surround the chest with indestructible bedrock on all sides.
Hopefully, my computer was in the same network with yours, and i intercept your packets to the minecraft server and get the position. Then i record the graphics-sound pattern of that minecraft world and use infinity-reality scanner to find this world in Omniverse. Then i use trans-reality matter transmitter to move the chest to the real world. Bedrock is impossible in real life, so it instantly desintegrates, and i get the popcorn from the chest.
I move the popcorn to the 1662 (Cuban missile crisis) with time machine and integrate it's timeline with humanity history: that popcorn is appeared to the USA president and made him calm down. If he didn't eat it, nuclear war would have started and all the humanity destroyed. I proved it by moving to alternate timelines where the steal had been attempted.