That's a really lovely touch!
If it were me I would probably leave a box of local farm eggs along with the bread, milk, butter and jam, tea and coffee. Some fresh baked pastries I think would also go down well so they could have pastries one day and eggs another. If you've got a local bakery you could ask if they do mini ones (costco do big boxes of pastries) - or you could buy frozen ones that can be baked fresh and I dont think they would be too expensive.
Perhaps you could leave porridge oats instead of cereal? I think that's a bit more filling and not as boring as cereal.
I think some fruit would also be really nice. Bananas usually go down well and are quite filling. Then if there's some left you can either eat them or freeze them to make banana bread with in the future. Apples keep for ages so you could just keep any that are left, and/or make a crumble with any leftovers.