If the bellows appears light-tight, so far so good. Of course, the actual results on film are what count, and I gather you have not gotten any film processed yet. Agfa bellows are notoriously prone to leaking -- Jurgen Kreckel (certo6.com -- very informative site, and a great source for repairs of folders) will tell you so, and he's a big fan of Agfas. So you may need to budget for a bellows replacement sooner rather than later.

If there are small light leaks, there is some stuff called "Liquid Electrical Tape" (or something like that) that you can apply to the bellows and it may well seal up pin prick leaks sufficiently. Spray it into a container and then use a cotton swab to apply it to the bellows. You'll probably need three coats; let the stuff dry sufficiently (overnight, say) before the next application.