Disappearing tomatoes.

Disappearing tomatoes.

I bought two types of cherry tomato seeds and started them. One type was started about 4 weeks before the other type. Anyway, I planted them outside and the older ones (that I can't remember the name of) are doing fine but the Super Sweet tomatoes keep vanishing. As in, I've planted three sets of them and they've all disappeared. Not wilting, just gone. What could be happening to them? I check them every day, the yard is fenced and we don't have pets. There are lots of squirrels but no digs marks and the bigger plants haven't been disturbed. Should I give up or is it worth it to try another batch? I really wanted to try these but argh.
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