The IRS considers buying puts on stocks that you already own the same as "shorting the box" and can reset your purchase date to the day that you cover. It can cause a tax event if you cover but do not hold your shares for at least 60 days before the end of the year in which case they will be short term capital gains even if you owned the shares for over a year. If you bought puts and exercised them in Nov. or Dec. on stocks you owned for over a year you will have inadvertently have caused yourself to pay your taxes at the full rate. You would have been better off selling them outright.
If you did this out of ignorance, you could just pretend you did not know and plead ignorance if you get audited. You didn't hear that from me.