Oyster bracelet authenticity

[mosanman]

So for the past couple of months I've been trying to source a 97200 bracelet, and I came across two recently.





Both however, come in different packaging.
The first one is sealed in plastic, whilst the second one comes loose in a plastic box. The latter also has the letter 'A' after 97200.

Can anyone confirm that both are indeed legit packaging if bought direct from Rolex.
Also, what does the A suffix stand for? Is it a shorter or longer version of the bracelet?

Finally, is there a way I can authenticate these bracelets as they are not cheap!