Depends on how long they have been doing this and how much grease you think you've lost. These cvs have a s*** ton of grease in them so a little seeping isn't going to hurt them. But you should at least cut off the old clamps and reclamp them. The rolled edge band clamps work great.
Hey @Patassa what does a rolled edge band clamp look like? is it like the picture below? if correct do you know the sizes needed for the CV joints... also would this be better than what is supplied in the OEM CV boot kits you think?