I found out Edge Tamers are delivered painted red for a reason. I had one fall off and I did not notice until some time later. By then it could have been anywhere. I retraced my route and quickly spotted a very small patch of bright red in a snowbank between the road guardrail and the streamside where I had been dumping snow.
It fell off due to my installing it improperly. Edge Tamers work great and are indispensable for the many gravel/dirt driveways I plow, especially this season where the ground never did freeze and solidify as usual.