Due to its size I could not scan the below cover completely.
It measures 35 cm(=14 in.) to 25 cm (=10 in.)
The second scan shows the registration part not caught in the 1st scan.
The back of the cover is void, the gum on the flaps is still unused and the covers show no sign of use.
I have 10 more similar covers (same address)with lots of stamps on them, all cancelled Chaco in 1985 (can't read the date), but only 2 of them have the "Registrado" stamp. So I suppose that all those covers are CTO and the registration number is decoration only?
Nevertheless I show the cover here, because my question is:
Should I cut up all the covers? Many of the stamps are missing in my collection.
Thank you!

