We're testing a feature now on the browser and mobile clients that shows a recover held resource icon if you do any action that causes you to deselect an item that you were holding without depositing it into your inventory or storage. We'll add it to the PC client after it's been tested on browser.
On all clients, now, the server will refresh your held item data periodically, so you can also just wait 10 seconds to have it reappear in your hand if you truly still have it.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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