Yeah,
Check things out for sure. These WC specimens are where all of the Suri/BCC "issues/stories" come from. Things could work well, but I'd be extremely vigilant in monitoring stress levels and making sure the snake is settled. Stress can weaken an immune system's strength and that is what opens the door for other problems.
A 2 year old seems a safe bet if the seller is being honest and has done well with the care.
Just remember that an otherwise healthy BCC can quickly go down hill when stress levels go up.
Ask all of the important questions about feeding, housing and try to duplicate the environment (assuming it was well cared for) the snake came from once it arrives in your care.
Feed very conservatively at first, and maybe not at all for 3-4 weeks.
Good luck!