A lot of Panerai boutiques have very inadequately trained staff. Also, double check if your model is supposed to come with four black screws. And I also warn friends that authorized dealers will scratch watches, chew up screw heads when they change the straps. Most ADs don't have a watchmaker on site and they don't train their sales staff how to use these tools without scratching the watch. And the people who work at these stores don't care. I've seen Patek Philippe stores scratch the inner lugs of brand new watches with the fork tool on strap changes. Brand new watch, dealer employee opened the seal, dealer employee performed a strap change (took it to the back), and when the watch came back out with the new strap there were scratches on the inside of the lug. Customer felt like they couldn't do anything because if they raise a fuss, the store wouldn't sell him another watch. Another friend got his Nautilus many years ago, AD chewed up the screw while sizing the bracelet. Dealer employee gave it back to him, customer didn't check the screws, met with me later that day for a dinner, and I asked him if he got the watch new or used. He said, "brand new, just got it from the AD a few hours ago, and it was still sealed from the factory!" Well, "I hate to break it to you buddy, they chewed up your screws, and they probably chewed up even more screws for the links they removed, so we probably haven't seen all the chewed screws." Friend went back to his car, got the box and the spare links out, and we looked at them, and found three more chewed up screws.
Let's stop bashing Patek Philippe dealers. Those were two different Patek dealers, and both stories were from years ago. Here's a more recent story:
Christopher Ward Bel Canto watch, customer had it sized by Christopher Ward while he ordered the watch off the website. Watch came with multiple chewed up screws but it's not noticed since the watch hasn't been worn for months after delivery. Another friend who hasn't seen one wants to see it and hear it. And now, with two watch collectors looking at it, the chewed up screws are finally noticed. FORTUNATELY, Christopher Ward agrees it's likely their mistake and agrees to replace the screws and links after it is brought to their attention - even though it's six months after the watch was already purchased.