Not to be to much of a rain cloud, date the bag because o-rings do have a shelf life. Start checking them over good in 2-3 years for cracking or other signs of deterioration.
The OE transmission dipstick o-ring and OE transmission drain plug o-ring are both fluorocarbon (viton) o-rings. If you purchase replacement o-rings that show cracking after 2-3 years you didn't buy fluorocarbon (viton) o-rings. The shelf life of fluorocarbon (viton) o-rings is unlimited. The price for a -013 fluorocarbon o-ring from the manufacturers is less than $.04 per pc. The dipstick o-ring is less than $.07 per pc.
When I was at dawgs house this past June to witness the cam swap on Petemacs scoot, I just grabbed a handful from dawg when he wasn't looking. What are buds for?