So, I want I prefer to have most of my games on discs though I don't mind that much. I have seen on forums that game boxes don't show that they're part of Steam and I have never seen them either. I asked in my local Game[.co.uk] shop but they didn't seem to know either. I want them on Steam for the obvious reasons - VAC, community, etc.. Will the box say if it's part of the Steam client?
More aboutsteam labeled boxes
If a game requires Steam, it will say on the box, at least here in the UK. There are also some games which have CD keys which can be activated in Steam should you desire. Please note that this does not apply to all games which are available both in boxed form and on Steam. I believe the list to which games can be activated is through this link: https://support.steampowered.com/kb_article.php?ref=7480-WUSF-3601
If a game requires Steam, it will say on the box, at least here in the UK.