OMG No...
I'm from the rescue that sold Safari

This makes me feel really bad poor Safari I only sold him a few weeks ago and rescued him from a petshop at 1 week old he was underweight and in an overcrowded cage...I thought your cages were inside the house?
You know what. If this was me in your situation I would be knocking on every single door in my neighbourhood and the streets surrounding. Or even sneaking in backyards down my road ( yuh ok I'm that type of person that does extreme things when need be )...
Secondly I'd be printing out posters right now and putting them on every pole in the neighbourhood...it may have been someone's " child " that stole them and if they see the posters they'll know they arn't their kids pigs! If it wasn't a child...well hey atleast the people may feel incredibly guilty for what they've done ( if they are local ).
It would be incredibly odd for someone to just walk up to your house and steal piggies without knowing you, or without living closeby and seeing the pigs somehow...so wouldn't surprise me if they are still in the neighbourhood.
Do you have snakes in your area??? The bars on Grid cages could be wide enough for a small snake yo fit through???
Your 100% positive a cat didn't get in and get them?
Want me to pop round I'll personally knock on doors myself

??? ( have done a few backyard rescues

)
*~jess~*