Perfume…tester vs regular bottle?

I am looking to purchase cologne for someone for xmas…quite frankly, they could care less if the cap is missing…or its not packaged in the box..my question is..i see that there are tester bottles for sale on ebay and regular bottles..what is the difference between testers that are sealed in the box and regular bottles?
they are fullsize testers..like 3.4 oz and full..i just didnt know if the potency was different on testers

I guess the tester would say so on the bottle. If they don’t mind buy it.

7/11 ZIP-FM「BREEZY TEST」 Perfume

Vs Versus Cologne by Gianni Versace Eau De Toilette Spray Tester ( Damaged Cap ) for Men $39.99 Vs Versus cologne by Gianni Versace, 1.7 oz Eau De Toilette Spray Tester ( Damaged Cap ).

Burberry Brit Perfume by Burberry Refreshing Body Lotion Tester for Women $19.99 Burberry Brit perfume by Burberry, 5.0 oz Refreshing Body Lotion Tester.

Himalaya Perfume by Creed Millesime Spray / 120 Ml Tester for Women $134.99 Himalaya perfume by Creed, 4.0 oz Millesime Spray / 120 Ml Tester.

Emeraude Perfume by Coty Cologne Spray / 45 Ml Tester for Women $10.99 Emeraude perfume by Coty, 1.5 oz Cologne Spray / 45 Ml Tester.

Usher Perfume by Usher Eau De Toilette Spray Tester for Women $21.99 Usher perfume by Usher, 3.4 oz Eau De Toilette Spray Tester.

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