Dunlop Fort Unopened tennis balls (1961) 3 years later

Jan 02/2013...What do I do with this unopened can of Dunlop Fort tennis balls from 1961?

Again, as I mentioned in the 1st video I did on this 2-3 years ago, here's what it says on this unopened can:
DUNLOP FORT TENNIS BALLS
Go Where You Hit Them
Bounce the Way You
Want Them

The extra nap on DUNLOP Fort Tennis balls gives you one-third more play on any court surface - helps your racket to better grip the ball and so give you far more control.
They always take everything you "put on them." They go where you place them,
then bounce the way you want them - and last longer!
That's why they are used in more OFFICIAL TENNIS TOURNAMENTS across Canada than any other make.

Made in England....Inflated with Nitrogen

...they stay livelier much longer than air-inflated balls. "Pressure packed three to a can, they come to you as fresh as the day they leave the factory."

DUNLOP TIRE AND RUBBER GOODS COMPANY, LIMITED
Approved by Canadian Lawn Tennis Association.

Do I finally open them? When? Where? Ideas please! Thanks~mike at [email protected] or right here at youtube.