First I would try a flash light if you have a straight pipe under the toilet.
By now, you may have used the toilet a few times and the object probably has moved.
If it was me, I would try to get it out.
When you get home, drain the tank and flush it well....very well.
For about $15 you can get a USB endoscope camera (camera on the end of a cable).
Put it on a stick, and go looking around (it has LED's on the end for illumination). If you don't see it, it likely slipped out while draining.
Here you go...$12
USB Endoscope Camera
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