Apparently some people have some odd things in their coin jar. Here's Coinstars list of unacceptable items.
https://coinstar.com/howcoinstarworks
1943 US pennies
acorns
alcohol wipes
animal crackers
animal or human teeth
bandages
batteries
beads
bells
belt clips
bent coins
bolts
bottle caps
broken glass
bullets
buttons
candy
candy wrappers
cardboard
cat litter
chains
clay
commemorative coins
confetti
contact lenses
cotton balls
cotton swabs
crayons
cuff links
damaged coins
dirt
dirty coins
dog food
drill bits
ear plugs
earthworms
Eisenhower silver dollars
erasers
feathers
finger nails
flash drives
foam objects
foreign coins
fossils
french fries
fruit snacks
glitter
gold fish
grass
guitar picks
gum
gum wrappers
gummy worms/bears
hair clips
hay
jar lids
jewelry
key chains
keys
lint
marbles
matches
miniature dice
mints
mud
nails
name tags
nuts/bolts
paper clips
pen caps
pencils
pills
pine cone parts
pins
pipe cleaners
Play-Doh
playing cards
POGs
pop can tabs
popsicle sticks
quilt squares
ribbons
rocks
rubber bands
rubber lid seals
sand
screw driver bits
screws
SD cards
seeds
shells
soap
soda
springs
stickers
tape
tie tacks
tire caps
tissues
tokens
tooth picks
tree bark
twigs/sticks
vegetables
wall hooks
washers
watch bands
wheat
wires
yarn
https://coinstar.com/howcoinstarworks
1943 US pennies
acorns
alcohol wipes
animal crackers
animal or human teeth
bandages
batteries
beads
bells
belt clips
bent coins
bolts
bottle caps
broken glass
bullets
buttons
candy
candy wrappers
cardboard
cat litter
chains
clay
commemorative coins
confetti
contact lenses
cotton balls
cotton swabs
crayons
cuff links
damaged coins
dirt
dirty coins
dog food
drill bits
ear plugs
earthworms
Eisenhower silver dollars
erasers
feathers
finger nails
flash drives
foam objects
foreign coins
fossils
french fries
fruit snacks
glitter
gold fish
grass
guitar picks
gum
gum wrappers
gummy worms/bears
hair clips
hay
jar lids
jewelry
key chains
keys
lint
marbles
matches
miniature dice
mints
mud
nails
name tags
nuts/bolts
paper clips
pen caps
pencils
pills
pine cone parts
pins
pipe cleaners
Play-Doh
playing cards
POGs
pop can tabs
popsicle sticks
quilt squares
ribbons
rocks
rubber bands
rubber lid seals
sand
screw driver bits
screws
SD cards
seeds
shells
soap
soda
springs
stickers
tape
tie tacks
tire caps
tissues
tokens
tooth picks
tree bark
twigs/sticks
vegetables
wall hooks
washers
watch bands
wheat
wires
yarn