You mean the slider? The slider runs up and down the zipper chain to open or lock the teeth together. Check it again. It may be folded under or hidden in a pocket at the end of the zipper.
Maybe the last person to put the cover on put it on inside out; then zipped it up with a fingernail, paper clip or safety pin. There would be a zipper, just the part OP is to looking for won't be visible.
If you want a cheap mattress to have a zippered cover I think that you have to buy a cover seperately and put it on the mattress over the sewn on cover.
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