soundcheck + aobtd of the 21 03 1981 concert

in a snowproduccionnes dvd call ''before argentina tour " they are a soundcheck list as from " 21 03 1981" plus AOBTDust from this concert
is it the true date or just a soundcheck from another date?

Thanks in advance dear queenfan

Its the Soundcheck for the Morumbi-Show, WWRY & AOBTD are from the wellknown argentinien-show.  a bit confusing.

MERCI BEAUCOUP