As far as I know I did subscribe in their email,one of many other site I subscribe, the problem is there are to many to read due to various email subscription,not into high grade and slab but interesting to see the pop report for comparison or additional info. sorry can help on that field I'm no expert in grading and slab coins.cloud internet maybe.
As far as I know there are three major authentication and slabbing company in USA one in Canada one in UKGB,none in the Philippine or Asia but there is PNAS and many expert member and writer.
They can make a slabbing company in the Philippine but there are many debates in raw and slab collectors,in order to do that,they have to gather all the expert that they can gather and all info in the history of coinage of the Philippine,just a comment.