Perhaps you could give him a little porridge as well, Catja - in fact all your hamsters would probably enjoy it and it's good for them - especially for fattening up little Mishka
I sometimes cut up the large pieces in Harry hamster to make it a little more palatable to our dwarfies - you may find he eats more if you do that.
Definitely try the seeds souffle suggests
we add them to our porridge and any left over - and there often isn't much is given to the hamsters
They love pumpkin and linseeds, as well as the old favourites of sunflower and sesame
Location: Yorkshire, UK but my heart lies in Scotland!
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Will they be coming back in stock? You could try another health food store for a similar mix or even some of the supermarkets have them in the health section.