There is a misprint. The soft sign is after "н" but not after "щ".
"Возвращеньице" is a diminutive for "возвращение". So it is welcoming you back.
Here, there is no a soft sign at all. This made up word is sometimes used jokingly in the opposite to another made up word "невозвращенец" (the person who've not returned back or defector).
So Long, and Thanks for All the Fish
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