And when I checked back to see if any DT took any action I noticed all proofs were gone, what they basically did was gave some 20 merits to a post and finally the user who was merited deleted the posts , so if we check their accounts now they just look like normal full members account and now based on what we have we can't really call them merit abusers
On the merit history page you can only see 120 days old merited activities. This is why you are not seeing those old transactions.
Update:
We already celebrated the day when you were not here

All good things must come to an end.
Today marks 120 days since the merit system was introduced, and as Theymos said, old entries are going to start dropping off the file:
https://bitcointalk.org/merit.txt.xzIf you want a complete list of merit entries, you now need to keep your own historical records.
Oldest entries (120+ days) will also start disappear off of individual merit pages.