If you remove modules with the intention of reusing them elsewhere (rather than temporarily for decorating) it's a good idea to reset them to factory defaults before removing them.
This ensures that when you reconnect them (months) later, Cortex will recognise them as new items and automatically assign them fresh addresses.
This can be easily done using the Insight Editor to send the 2 packets, tell Cortex to ignore the new units when they pop up on reset.
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