Please don’t add any more piggies in with them - it will lead to fall outs. You can only keep two boars together in one cage.
If you try to add a third piggy in, it will cause them to all fight and at worst you could end up with all three of them having to live in separate cages (at best you will still end up with one living alone).
It doesn’t matter that they were previously together, even if you had got three at the same time, they would not make it long before falling out and needing to be separated as boars dont tend to function long with more than two.
If you were to find you want more piggies, then you will need to have a totally separate boar pair in a second cage.
It’s only sows who can live in groups.
Ensure your boar pair have plenty of space - they need a 180x60cm cage or a 5x2 c&c cage - as boars are more territorial and can struggle if there isn’t enough room in their cage.
Also ensure all hides have two doors in them so no piggy can get cornered by the other and ensure you have two if every item in the cage.
The guides below will help you with information on keeping boars.
A Comprehensive Guide to Guinea Pig Boars
Adding More Guinea Pigs Or Merging Pairs – What Works And What Not?
Boars: Teenage, Bullying, Fighting, Fall-outs And What Next?
