Master Reg explains the in's and out's of shipping bolts used with LG washing machines:

... the washer was transported without any bolts to secure the tub...

from the WM2487HWM Owners Manual:

The appliance is fitted with shipping bolts to prevent internal damage during transportation.

Packing and all shipping bolts must be removed before using the washer.

Take out the 4 bolts and braces by twisting the braces slightly.

Keep the 4 bolts, braces and the wrench for future use.

• Whenever the appliance is transported, the shipping bolts and braces must be reinstalled.

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Source: LG WM2487HWM won't complete final spin gives UE error