Just as an aside; the same thing happened to me recently. I recently started a PayPal after many years of not using them. Long story short; I sold an item (a nice set of pots and pans, skillets etc.) and used G&S. My buyer showed as a "verified" account on my end (I am verified too) and PayPal put a hold on my funds. I called but they were not very helpful.
I said, "Ok" and went on with the transaction. I made my shipping label through Paypal and shipped the item USPS. I plugged in the tracking number, and about 24 hours after the package's status said "Delivered" on USPS's website, the funds were released, no problem, no explanation from them, no email saying they were available, nothing.
I ended up calling again, and this time I received a better answer, or at least one that was plausible. I was told that since I am a "new seller," and do not have a long "seller history," they held the funds "to make sure the transaction went smoothly." Bottom line: I was told that when I have 5 good sales-- no disputes, claims, or mess-ups--they would not hold future payments. Fast forward a couple dozen "good sales" later, and I have not had that problem again.
I'm still learning the various nuances of PayPal, but so far it has been a solid platform to buy and sell.
There are definitely some policies of theirs that I do not agree with but it is a very convenient way to transact online.