If you want to see some custom melee weapons then you should play these campaigns:
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- Sledge Hammer (bt_sledge)
- Plank with nail (bt_nail)
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- Arm
- Foot
- 2_handed_concrete (in VPK but should not appear in campaign)
- Concrete1
- Concrete2
- Muffler
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- Foam Finger (b_foamfinger)
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- Broken Bottle (b_brokenbottle)
- Leg Bone (b_LegBone)
These are the campaigns that came to my mind first.
Maybe there are others installed with custom melee inside.
If you find some, tell me and I'll add it here.