OP, i'm with the others suggesting you let the material items go. they may hold sentimental value but aside from the pictures (which you should ask to be transferred to you, emailed, put on a usb stick, whatever) you need to focus on what's important.
you need impartial advice about how to handl access arragements. you sound beaten down.
it's quite unusual for a 6 month old baby to be given to overnights.
yes, it's best for everyone if baby has a strong bond with his dad - of course - but not at the risk of reducing breastfeeding, so young, when she's away from her primary carer and is still so small. his desire to have her overnight cannot, and should not, override what's in her best interests.
op in the kindest gentle way you're focusing on small, trivial (i know gifts aren't trivial, but hopefully you'll see what i mean) material things... it's like worrying that your garden's getting singed when your house is on fire!!!
you need mediation, lawyer, etc to put in place proper (more normal) custody arramgenets which are suitable for the baby's age. this will change over time.
i'm concerned, and you should be, that you've accepted a custody arrangement which is for a much older baby. you need to get an objective view on this.