It's a very scrawny, narrow-leaved form of Skimmia japonica, probably
'Reevesiana' that has spent years in very heavy shade - hence the drawn
out stems and unripe berries. The pale leaf margins are not true
'variegation', but a result of the plant being deficient in magnesium
and it's a fair bet that the soil was also too alkaline.

Given good, humus-rich soil and a decent amount of light, it should
revert to being a dense, low growing, domed shrub producing terminal
clusters of white flowers in spring that yield red berries lasting well
into winter.

By all means plant it out and drench the roots with a solution of 4
heaped tablespoons of Epsom salts (otherwise known as Magnesium
sulphate) mixed in 2 gallons of water. If your garden soil tends to be
alkaline or neutral-alkaline, you may need to apply Sequestrene every
spring to prevent further chlorosis.