The easiest way is to first reacquire the object (using shift-K to globally turn off squelching if it's no longer in your inventory) and then repeat the squelch command on it. If done correctly, the object will no longer be squelched once you reenable squelching. If not, repeat the process until you have done it correctly.
Alternatively, you can undo an "all objects of type foo" squelch from two different places in the settings (=) menu: the ignoring submenu, and the autoinscription submenu.
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