Probability of winning sweepstakes, put all coupons in one box or split them between boxes?

winning sweepstakes
by ttrentham
Question by Blue Em: Probability of winning sweepstakes, put all coupons in one box or split them between boxes?
A mall has sweepstakes where they give you a coupon for every X dollars you spend (amount is not important). You fill the coupon with your contact details and put it in the box. Every two weeks, they draw 10 coupons, give their owners prizes, and discard the rest of the coupons.

Now, thanks to some very big purchase we made, we have about 300

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