I would have stripped down to my skivvies and jumped into the creek immediately to try and find that forearm. It's been over a week now and the wood is likely not too good, but I think it would still be worth a try to dive in with a diving mask and some fins to look for it.
I'm not sure of the water temperature so that's a factor. If the creek is tidal fed then the current might flow both directions, so the forearm could still be in the general area. A splinter forearm would sink rather quickly and likely entangle in growth at the bottom.
You could even jury rig a breathing tube tied to a float that would allow you to spend more time under water searching. That is your best bet other than waiting to find a replacement.
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