Not only that but your gun may not be the same as when the authorities relieved you of it.You should, but it might take a while and you might need a lawyer. Most agencies will give you your gun back, but there are a few, that will drag there feet depending on whee you live.
And I'm sure that's the idea on the LE side also. Excuses or not, I'd have been there on a daily basis with written request in hand and a record of each visit.My fil never got his back. He should have, but there was always one excuse or another. Honestly, I'm not sure why he never hired an attorney to force the issue, although I'm sure it was cheaper to replace the gun than go through the legal hassle.
When my FIL used his Rem 1100 to end his life (in GA), the gun was held until the autopsy was completed, a matter of a few days. It's been with me ever since.The same with suicides. Family members will eventually get the blood spattered gun back. Of course, it will have rust spots on it by then. A friend got one some 2 yrs after a suicide of his father in law.
The guns are not confiscated. They are held as evidence.