It helps if you read all the rules for the objects

For example, from the 3D objects document:

3D objects function like object tokens, but provide the bonuses listed below when attacking with the object, unless otherwise stated.

The Mailbox and Soda Machine both increase the attacker's damage dealt by 1, when the object is used to attack.

The Bookcase and Computer the attacker's attack value by 1, when the object is used to attack.

If you don't use the object(s), you don't gain the bonus. Simple as that

EDIT - In stereo, where available

Thanks for pointing that out Queb. It's funny I missed that, I read that PDF 3 or 4 times when I came to my conclusion and never noticed that sentence.

YA BN!! No extra advantages to your stinkin skrulls team. Aha now with the other question answered about stealth while holding a continual object not being correct it evens the playing field!!

Ha.