...and no, it wasn't a bug!
I found a note from Tucker! (I tried to take a picture of it but the light kept reflecting off it and you couldn't make it out!)
Apparently, he enlisted Michael's help in opening the container and he left me the following note (I'll include the spelling):
"Hi Momy, I hope you have a great day. me and Dady will be at home befor you. enjoy yer salid! love, Tucker"
How adorable is that?!